Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f19b3e8039ece939d5d5c9abb43db5abace60827cf70a92f9db7968c7f6f93a2' 
  AND token = 'cT1ciYjTDFTUY6xUam0h+GXVrzYQYU77c0BHjtd6J0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}