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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e94d1882f700abe5384124464ea4f6c8445cd68c2b17b7f305ecaefbc609e9e8' 
  AND token = 'elt+xUJ8ZhSDH64pSTkWGJ7xahfHio/ASX6LauoNJVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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