Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b84002905fe780054f70b927f334cac39b45e5876868044dbe86bdae8f6ccdb9' 
  AND token = 'ikWuz3uwh1/qQ1cvpI3AMCPEdcuzsg1Ut6xCefzAQTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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