Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8a78388e5a93d1765b52226d506ddb3bd0e24af870e5815450ace012ea25834' 
  AND token = '2eZ4RGTYcmziBXBlvdMsDZzqEXYnPW6BNuGGBgMOaOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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