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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '871b2c946279d9b1a23826ca89fc8337744aac18af32a92ce76563d6fa4cd7dc' 
  AND token = 'JO6AjSe2QYAyPfgQKPVHehIbLcuopYJyE0TXg/NxkuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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