Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38274f25a78fe771942a5cf92f36d292729f7dfcc605206be50299195d14f944' 
  AND token = 'AqrcucA+Z7ROcGYcdXPfW4CKva+PaI0lnLp8B+8NVnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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