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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f2342ad9d486cc15064aca18a425a926812c20b6cfd8f14f348fd41f455d6074' 
  AND token = 'NF9J552/hUxhi6Dhwv0yjMw7llV7QA44ZQJwyoaWbjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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