Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f5db6abcad823b23a169b65ccf9a465df23211758da35271044776841e1213bb' 
  AND token = '9rVavgOQyXUxSu3pUf5X6R7+fWYICeaDh3cZIwoW458=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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