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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8dbe8d6860f776c2b13a7294691a1cda3e08f30d06cc7a36b2d8a8a33f993b16' 
  AND token = '4Pw5Y/7ZDQ0OCqj8kuP4dCH0rN0fPL21kVK3K9NN1Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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