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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c3febccb153f07f2a035c29d7113bada9a5d2a731a4ca528aaf100babc4394ea' 
  AND token = 'BnCs/SAZeeI0muovbj3s9vayNpv6K1jMnYogLyuUr7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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