Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6a10dd9cd1728ce5e18f79522ca9de302e2af5215ac3ce443aebf296dde8642' 
  AND token = 'f1fQ6pS6hIFeChVxDpT5XO132ncFztQHA35hbBr0qKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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