Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3412306dd3fe49c2f8e61889d71380fbc4a7e6a2538a14aa74d132e6c4ad0b2f' 
  AND token = 'tPFAOY34oySQw/bMh+k3ZG8P2q6zAdxuxVnhXTWQtWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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