SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b82662d761c39447eb3c8761cb4d462223a240fd05df4fe21f9361ad8cff8866' 
  AND token = 'T+51uAW0HOZdzwQh7EixHgVnROSfho0xJbnjrmW1lg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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