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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8035b51636eac46a4b86bc0d1e6c12bc9d85912b8f2db27265676ce1eed9802a' 
  AND token = 'EPrb80oai0B8i+zh3E0DLg+QkW5R3bpq5mUVZPYqkZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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