Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88271ff29c876e37a1dcf7929ca4f625ea0a56296b5478f07d640c494ae0b05' 
  AND token = 'Tod2dAsZpw4PyOOiRRz8dXuzsgLL1EcawdjNZJ2Z+Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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