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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fbb87ec366b5659bed051d9218024c5c673eb33a9c831d3738f7c65ee152ce37' 
  AND token = 'P9LQiEWOYaY3sQbRISRbaSF52rHjXRRZLkhvDn7bTWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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