Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af6f97eba41180cfc3e82aaa802d29e54e8c125c14bd2578580ab992cebcc048' 
  AND token = 'wzqnLAx/KecxG4+K39hO3RTVgvV3y8COhjmKzqvrryc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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