Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f1122e63f83d77ab4298af059904141bbeb4d965e1ce52c4fb270b546cf47b' 
  AND token = 'dfuZhWd+gQ05IlkgcNXFE96N6CYelid78SvcX4zibvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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