Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac8848bf0f895c4b71cbd960ca083b079306a7bedfeeae4f88222f94f489ce2' 
  AND token = 'k6zR8E7pQCpDOQmRmLrvP6I0pYJ4bXAyRPcNNN+mnUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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