Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3fee7714bfd6d7f30bb9e14532de9979810a87e930f30ede2a2c8d64c2aeace' 
  AND token = 'xuF4EbNlcFUxiBkzHFE01+ao3ub/mmuJKKNh3V8rmTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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