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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '54040987a0bef6b26b01383f930b8f99ef952e7d109e9af291ccfcff88091ee7' 
  AND token = 'FXxv0mUKuJXc7O4MtrhcYl5tobjb+3E2lB+NqZyJG6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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