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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd9ece9277efac794e0cd32f8b749b4c4eee2312fd0e15920f43454d74cc6ba65' 
  AND token = 's3ptmGFtH5F9woe4Z3RHAZRguuOZZJ99hNibVZB9Hy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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