Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6fb85dc197a89aa90689d499387bcc49205723b9a9f5209b51a113cba0594be' 
  AND token = 'ez85jid8sqscX+GIh80BTIgeQxVFrehoKLNhc3Xm15U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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