Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c828bca07ddcf6442ff6966842a1263844760fa5ac2dc3254a107d13a427359' 
  AND token = 'xyeU5gbrKacLtC9bkJRaHPn5nkIj5Og55RCNBiXRAE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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