Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53239a5e59d5f2c4f72fe6069c55a4b09e81dd0f634ab6ce29ab2b0df0f1fa04' 
  AND token = 'RB7qyEJNt1u4F6PVJ49GXrpcH9HRUhaIC+P8w5/iSkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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