Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71e7eac75a931c61cabbc9fbd74c219dae4fd38c57059bb0aef0565eba5f0e7' 
  AND token = 'pahezI6Wnsr/F0BiMHKnx0aJCIyteSWJSx1lYdJE4Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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