SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a450637cd0b25910950f92f6225f78fe888d0f53670db5c1ff0dced711a31ee8' 
  AND token = '0MSRnJU0hStzjUw7SnwJzvcZh7Sln6pGS/gZrbx8JrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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