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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '042afd9a8260e78a4677affa5f375a3795793980e4ec59baa99fdbd6e697232e' 
  AND token = 'HQTlMs9brr+m5qZyjLOikWMskAAfS+3f38y/ffSIass=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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