Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84b46182393d4de0309857bafb4ce3370210f453fcc849cf0bee926392b85f4' 
  AND token = '6sCprIhvc5okVEc+tQq/lDupQiGx6zcC1Gz6gnMXnyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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