Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28e376fec921e59c8c43ac33b79ec9e9c765b106da3c6366de05e53e627e1c60' 
  AND token = '3AKeqgzBRRI03ZlTAgOIRMMDy0wl7VHpOmCnwPsSOIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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