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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c9e7074710549429bff2114e878658d8cff121aae6f3d9b5ff92029a8650dc56' 
  AND token = '7XGbZqCYoE78yCkZ7fJdVZGmyj8lDkVk+dWkrwu5dKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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