Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56f6d17762f90fec4e58646ef1495ab4c3eed5b939c1f94349278a1b721830b' 
  AND token = 'fGdmBPmRK0RyBPEsKt3GSkjEmA8ftntlveG+424tZZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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