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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '665a40e529a8fd1619ea6c9c9d28d8f8ce18067fa0b53f86733f1d79b0464d6e' 
  AND token = 'G4utXZMPXpYXBAfR7ZLkumTxjff3mtG8Czffi9y2KLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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