Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a63731963abf1bfdf4179d517bbe0839c80978938e3a1d880a24d7ed68f0cbc7' 
  AND token = 'ZCWdocrIsne9dmMFmpQORpdJ9uPkbotAOwkpWwSApUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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