Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c750c288f6b467bbd38429e369935232ba871e2773e60c6d1da92d8d05df5fc9' 
  AND token = '//ESCnjIhre6vulq3H4iCaslEjvMcRdbMtDAIiFDk40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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