Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '520d35694176987c6fc5cd878f2b2f7d3cde48571dd875fece142bc54b2d255c' 
  AND token = 'Twfxk7Ey7UCq3Muso7rVpK5ixEt8elCtP1tH01+5prw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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