SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1a0b4541d7156cf26c1f9bc503ba606abcb90e4cb5f14776854579b1036a021d' 
  AND token = 'GNUQlPzPiaaTWvCfft9TyJY1umes+Zom82Kq8o1XvVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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