Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b51b76e0cff9c53ca85d2703ff9f94f4bcdeaf77715973b9003c077ee9d4dbe' 
  AND token = 'Ejps6ACJA6KO+ka6OaTPeWWQ32AVmznpFBMzdJBRJZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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