Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b52b92235161e291b2ef76b68c2960b4b4ae4ae7cd9418b3b1157318ec6420' 
  AND token = 'PkE43mh2mlEPdP+qZIbruUBF3aaKozikQQSXx3WIft0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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