Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15a0a15f534da719c4d8db8d93839b4b31d9a5aa7f73fc4aff83f3912d95513b' 
  AND token = '3VoIEI1XepWgFm6Z8Bt/ktv6vcU7BwYgMT1pnSNWddw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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