Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38e9d9650134c166dd730994de6097b752b70718edee0f0e3ae6cf4e90214905' 
  AND token = 'V3jkwrC/1IOZn4dPXcmybisyCMLO3+yKaWpdu6L1N/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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