Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'da39e28132fce12230d891b6bee785baca65f6e02a935f64a193cff2ce9687f0' 
  AND token = 'AkeW2exTMwAkjKrmcZCj2IKuIPIyBmFDk0eorSKpYtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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