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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '414804bd817c70dbc18effa10619b013e85e23c86921685d7850a426f9a90fbd' 
  AND token = '3isNUyg0CttrsHZt/V4GRDgcHmC3dUgQqC9PUru/k70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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