Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0452d4ae109d67509932423bee47baaaadcabdd5703d1b67733e9e44906334bc' 
  AND token = 'k3pwcQwfoo4OvFiYfDLoVDQyyVnzCqX0GRvXjSFcujg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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