Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee7f524f678cfac7a97bc6052d1bdb097d6b21b8af60222ae4b78421d96c807' 
  AND token = '6tg+r7hkN6Sx6MWLFen6avWBxkIuQbo6YKgpY6JrU1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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