Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8917b303b7e45bfd1b6274aae0490aad39d1152d42f312222fc5e93c50bba44' 
  AND token = 'IYAnp1l7Y8EsvpPEb/QtJtgnnByAHcsCSeSTkhwbAVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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