Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50c0c3d94bb619ccbe7939165acf9c189e4dd05312e2e85b3f952e4d1dc57b7c' 
  AND token = 'hO38TnxirWUOQ4zOr6Vn1ci6ba1OCXTrLoTzDVd7j5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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