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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b6f672672a7457398c3d6d5813373631fbf84104818f66394662b5f2d830cc60' 
  AND token = 'oiEUQqdc6tH1R1ehxv8mU0rgfSMPrWsh7ydMy/Eg78I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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