SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8aead3c4732ac68c39d8e714887fb65eabff3423f0c80ca1a2afcf672ec54eae' 
  AND token = 'e9QWRMzo9lLA5D/RBqv0XACGN4TVK2unwKA/Zw5NmH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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