Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '310417d9570ef9b78f1e1121fb78ef8110bc37fa204a2c864bed16eeec85b17e' 
  AND token = 'pwWI3Dj4KPNCIvZO9cA6tR/H2Ee37Hs0uptbOcu1rnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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