Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb0c24174c92ad338b48c068c8ca68d8190110cd814f3aa6b58a549ded2c054' 
  AND token = '5sGat4CUwSWvqn+AKhl05QNRVGFNCeHDrddZrl+LTB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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