Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '32b5b13030d87f2a5583760ba50ec1f52018a5b879bc59b57a5ffb4d25a51ad4' 
  AND token = 'Ev4VG48mWnPsEPcUP9jJOWDlvH1OPF/uIdjstJmKP14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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