Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edc6243d2a9c11b3eca67188ce4fc9f3c76ff342d2376f7d7106622327eb8b21' 
  AND token = 'eNjIIFtWA3JKbIsDdvluX5xd6TlEd7PtD5jxy1oV/Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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