Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de46f9846c986cba73b599370185f6f4def38f103786c307ef679e8366fd9c96' 
  AND token = 'iGOt3E7dz//Piy3qePdfN4a7PUuPWDCah+Z+qh+MoXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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