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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1fc22f162f99b76641d81fc93b00811d74fbc18263265836aff4f34929c4e60b' 
  AND token = '7JByAouVB5d235quLOZCQQlokPxb+X7I8EuJCczP7kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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