Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb89798bcd45a33c2e37884ee68dc600a6f76474275facae4cf3cba97897a01' 
  AND token = 'de6kev4iUizFZle2pekhsaekTxve2bo/9byPuR2UzEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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