Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2e65df6eabd0992e424a5a5cd9d65fa9ccbd5ef25bca24b1c91c18ce0738f61a' 
  AND token = '3KBpBQd/MBd4VtyCbtoELmPDGdc3Ib+GN0VZQQ1iUx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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