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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '24a3d2d2806fa58b4d9a6edaa16c0e2ed885021e85e0616d20a42910a8ad3edf' 
  AND token = 'ETTWQIsMwEiTmKenokujrU7DS0sF0cvwLYaiXLa8Skw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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