Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e27c33f41bccb3823aff8299734b9bb093d076f4452523a1ce83c5e6ee7959ef' 
  AND token = 'Rc8aD3rdv1ooBChGOJPQr3uUU8PEqcGH8IjCsi4vZmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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