Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a98e691789576a83cef652ba4d50ef0b8ff09df0e98834a3f394a316918a1611' 
  AND token = 'PzFxg44hnD/8J2h/W5Cym3Ok/FYWj/GAmkZbyjhLbW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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