Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd42ca4b87d91d19412b20099239089cf3f61c276d49fc9f3d9a3f143af49b1b' 
  AND token = 'ugy2EDASRs7bJr0G7JWz0A6/qBFPiE6b32ofbEHWSMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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