Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '375a1b75a8b260e053dd73f7e4bd923cf857d958e83b5b150a231d4c9f28b121' 
  AND token = 'WVo1H7kUVYUAnVDjpecqUa1hCNgju5R+hNthv+u0mr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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