SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2a34824bec3d8366598f48f28850055a5ce42b0f98b4a7647719ec6ab443c5ec' 
  AND token = 'lZquL4ee+lIG4uvJpaKYtCeJitF1xdzPyJUBWX7xNLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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