Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3076df671efd6493abddc04b9b1481eefb48a36b390ccc26b0bc6169a861cc2d' 
  AND token = 'SU1FHCojNSRw4teNJeR2arC+0ofTG73dVUBEJY8tCyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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