Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c36cdbdf3c88e48c402bb0af87f275194423256f89a422ac4ef8522156ada93' 
  AND token = '3vn5QiD03Uga47a1+dWM5Hqn2yelzH0yc8GZOxr2D3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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