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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2ba06b6d85042e665baeb5718a49b8f5164d34b5e2170cd7cd0af0fb1b686aae' 
  AND token = 'Ecaj9FDq8At99gvyyPveDeCJ7vrM1xfqm2dTBhIf6S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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