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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '01b85477eac2e629697a1377314026f047fd4842359006b485a77e5364f51160' 
  AND token = 'GBeJ8PpyZ08orTHTtNsuS3lbRVAJvDi7N7qillZ/5IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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