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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9b24d03cf561ca5f67160f51b0afe210a15f7181d4b6720677c76d87062b8c80' 
  AND token = 'O6x5hRcZ90qr7M1mrJSIsTPa5ATSSOxZeT1ORcNW/tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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