Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d5f31f1aba0f723e57e090114d7f58b59550d3316ae50ee250f41c9874baf87' 
  AND token = 'MU+/2kncmzHYzmZ8TJql4W6lqqYDEfDkyiX1Ot+N03k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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